Nano Archive

Fluorescence switch-on sensor for Cu2+ by an amide linked lower rim 1,3-bis(2-picolyl)amine derivative of calix[4]arene in aqueous methanol

Joseph, Roymon and Ramanujam, Balaji and Acharya, Amitabha and Rao, Chebrolu P. (2009) Fluorescence switch-on sensor for Cu2+ by an amide linked lower rim 1,3-bis(2-picolyl)amine derivative of calix[4]arene in aqueous methanol. Tetrahedron Letters, 50 (23). 2735 - 2739.

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Official URL: http://www.sciencedirect.com/science/article/B6THS...

Abstract

A highly selective fluorescence switch on sensor, L for detecting Cu2+ has been synthesized by introducing a bis-(2-picolyl)amine moiety at the lower rim of a calix[4]arene platform via amide linkage. Binding properties of L toward ten different biologically relevant Mn+ ions have been studied by fluorescence and absorption spectroscopy in methanol and aqueous methanol. L was found to detect Cu2+ selectively down to a concentration of 196 and 341 ppb, respectively, in methanol and 1:1 aqueous methanol even in the presence of other metal ions. The composition of the complex has been found to be 1:1 based on the Job plot and is further confirmed by ESI MS. The role of calix[4]arene platform as well as the pre-organized binding core in the selective recognition of Cu2+ has been demonstrated by studying appropriate reference molecules. The possible modes of binding of L with Cu2+ have been modeled by computational calculations. L and its Cu2+ complex could very well be differentiated based on the nano-structural features observed in SEM and AFM.

Item Type:Article
Uncontrolled Keywords:Cu2+ sensor; Fluorescence switch-on; Calix[4]arene appended with bis-(2-picolyl)amine; Nano structure
Subjects:Material Science > Nanofabrication processes and tools
Analytical Science > Nanotechnology for sensing and actuating
Biomedical Science > Nanobiotechnology
Material Science > Nanostructured materials
ID Code:5656
Deposited By:SPI
Deposited On:05 Aug 2009 10:02
Last Modified:05 Aug 2009 10:02

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